Abstract
SUMMARY The results of this investigation indicate that strains of Staphylococcus aureus possessing alpha haemolysin are now associated more frequently with staphylococcosis in poultry than formerly. These strains were found to be resistant to penicillin and tetracycline more frequently than the other strains examined and to resemble human strains in possessing delta-lysin also, but not beta-lysin. The possible influence of the feeding of antibiotics to poultry on the emergence of strains of this type is discussed. The distribution of phage typing patterns among the strains of Staph. aureus associated with staphylococcosis in poultry was found to be quite unlike that found in a random collection of human strains, although similarities occurred with some of them. Strains of Staph. aureus present on the skin and in the upper respiratory tract of infected fowls were found to have characteristics similar to those of strains isolated from internal lesions.
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